1 /*
2 * include/linux/cpu.h - generic cpu definition
3 *
4 * This is mainly for topological representation. We define the
5 * basic 'struct cpu' here, which can be embedded in per-arch
6 * definitions of processors.
7 *
8 * Basic handling of the devices is done in drivers/base/cpu.c
9 * and system devices are handled in drivers/base/sys.c.
10 *
11 * CPUs are exported via sysfs in the class/cpu/devices/
12 * directory.
13 *
14 * Per-cpu interfaces can be implemented using a struct device_interface.
15 * See the following for how to do this:
16 * - drivers/base/intf.c
17 * - Documentation/driver-model/interface.txt
18 */
19 #ifndef _LINUX_CPU_H_
20 #define _LINUX_CPU_H_
21
22 #include <linux/sysdev.h>
23 #include <linux/node.h>
24 #include <linux/compiler.h>
25 #include <linux/cpumask.h>
26
27 struct cpu {
28 int node_id; /* The node which contains the CPU */
29 int hotpluggable; /* creates sysfs control file if hotpluggable */
30 struct sys_device sysdev;
31 };
32
33 extern int register_cpu(struct cpu *cpu, int num);
34 extern struct sys_device *get_cpu_sysdev(unsigned cpu);
35
36 extern int cpu_add_sysdev_attr(struct sysdev_attribute *attr);
37 extern void cpu_remove_sysdev_attr(struct sysdev_attribute *attr);
38
39 extern int cpu_add_sysdev_attr_group(struct attribute_group *attrs);
40 extern void cpu_remove_sysdev_attr_group(struct attribute_group *attrs);
41
42 extern int sched_create_sysfs_power_savings_entries(struct sysdev_class *cls);
43
44 #ifdef CONFIG_HOTPLUG_CPU
45 extern void unregister_cpu(struct cpu *cpu);
46 #endif
47 struct notifier_block;
48
49 #ifdef CONFIG_SMP
50 /* Need to know about CPUs going up/down? */
51 #ifdef CONFIG_HOTPLUG_CPU
52 extern int register_cpu_notifier(struct notifier_block *nb);
53 extern void unregister_cpu_notifier(struct notifier_block *nb);
54 #else
55
56 #ifndef MODULE
57 extern int register_cpu_notifier(struct notifier_block *nb);
58 #else
59 static inline int register_cpu_notifier(struct notifier_block *nb)
60 {
61 return 0;
62 }
63 #endif
64
65 static inline void unregister_cpu_notifier(struct notifier_block *nb)
66 {
67 }
68 #endif
69
70 int cpu_up(unsigned int cpu);
71 void notify_cpu_starting(unsigned int cpu);
72 extern void cpu_maps_update_begin(void);
73 extern void cpu_maps_update_done(void);
74
75 #else /* CONFIG_SMP */
76
77 static inline int register_cpu_notifier(struct notifier_block *nb)
78 {
79 return 0;
80 }
81
82 static inline void unregister_cpu_notifier(struct notifier_block *nb)
83 {
84 }
85
86 static inline void cpu_maps_update_begin(void)
87 {
88 }
89
90 static inline void cpu_maps_update_done(void)
91 {
92 }
93
94 #endif /* CONFIG_SMP */
95 extern struct sysdev_class cpu_sysdev_class;
96
97 #ifdef CONFIG_HOTPLUG_CPU
98 /* Stop CPUs going up and down. */
99
100 extern void get_online_cpus(void);
101 extern void put_online_cpus(void);
102 #define hotcpu_notifier(fn, pri) { \
103 static struct notifier_block fn##_nb __cpuinitdata = \
104 { .notifier_call = fn, .priority = pri }; \
105 register_cpu_notifier(&fn##_nb); \
106 }
107 #define register_hotcpu_notifier(nb) register_cpu_notifier(nb)
108 #define unregister_hotcpu_notifier(nb) unregister_cpu_notifier(nb)
109 int cpu_down(unsigned int cpu);
110
111 #else /* CONFIG_HOTPLUG_CPU */
112
113 #define get_online_cpus() do { } while (0)
114 #define put_online_cpus() do { } while (0)
115 #define hotcpu_notifier(fn, pri) do { (void)(fn); } while (0)
116 /* These aren't inline functions due to a GCC bug. */
117 #define register_hotcpu_notifier(nb) ({ (void)(nb); 0; })
118 #define unregister_hotcpu_notifier(nb) ({ (void)(nb); })
119 #endif /* CONFIG_HOTPLUG_CPU */
120
121 #ifdef CONFIG_PM_SLEEP_SMP
122 extern int suspend_cpu_hotplug;
123
124 extern int disable_nonboot_cpus(void);
125 extern void enable_nonboot_cpus(void);
126 #else /* !CONFIG_PM_SLEEP_SMP */
127 #define suspend_cpu_hotplug 0
128
129 static inline int disable_nonboot_cpus(void) { return 0; }
130 static inline void enable_nonboot_cpus(void) {}
131 #endif /* !CONFIG_PM_SLEEP_SMP */
132
133 #endif /* _LINUX_CPU_H_ */
134
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